.box {
    width: 100%;
    /* border: 1px solid red; */
    height: 800px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.f-top {
    display: flex;
    justify-content: space-between;
    margin: 20px;
}

.f-middle {
    flex:1;
}
.f-bottom {
    flex: 1;
}
.f-top-box {
    padding: 20px;
}
.f-top>div {
    display: flex;
    flex-direction: column;
    align-items: center;
    border-radius: 10px;
}
.f-top>div:nth-child(1) {
    background-color: rgb(9, 238, 9);
}
.f-top>div:nth-child(2) {
    background-color: orange;
}
.f-top>div:nth-child(3) {
    background-color: red;
}
.f-top>div:nth-child(4) {
    background-color: gray;
}
.btn {
    width: 82px;
    height: 32px;
    line-height: 32px;
    border-radius: 5px;
    text-align: center;
    background-color: #fff;
    font-size: 12px;
}